129197027 has 8 divisors (see below), whose sum is σ = 133197792. Its totient is φ = 125236800.

The previous prime is 129197023. The next prime is 129197039. The reversal of 129197027 is 720791921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129197027 - 2² = 129197023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129197021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3599 + ... + 16472.

It is an arithmetic number, because the mean of its divisors is an integer number (16649724).

Almost surely, 2^129197027 is an apocalyptic number.

129197027 is a deficient number, since it is larger than the sum of its proper divisors (4000765).

129197027 is a wasteful number, since it uses less digits than its factorization.

129197027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20269.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 129197027 is about 11366.4870122655. The cubic root of 129197027 is about 505.5345475274.

The spelling of 129197027 in words is "one hundred twenty-nine million, one hundred ninety-seven thousand, twenty-seven".